double account and overbooking situation

Hello, i am writing to you because i have problem with my account. I registered my personal booking with property that i rent on booking. It has the same e-mail and password. When i want to log into my businnes account, my personal one shows up. The same situation with extranet. I want to log in to extranet and offer my guest different dates of their arrival becuase i have overbooking and everytime i try to log in my personal booking account appears.

Please help.

Thank you, Anna